Profileimage by Veselin Zhelev Business Intelligence, Data Warehousing, and ETL Expert from Sofia

Veselin Zhelev

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Last update: 15.01.2024

Business Intelligence, Data Warehousing, and ETL Expert

Company: Data Lidar Ltd.
Graduation: BSc. Engineering
Hourly-/Daily rates: show
Languages: Bulgarian (Full Professional) | German (Elementary) | English (Full Professional)

Attachments

Veselin-Zhelev-CV-2024-EN_080124.pdf

Skills

I'm a BI/DWH/ETL architect with 14+ years of experience in that field. I'm proficient in a wide variety of data tools: 
1.ETL-SSIS, Pentaho Kettle, Talend, Knime, Oracle Data Integrator (ODI), Informatica.
2.Databases-MySQL, MSSQL, PostgreSQL, Oracle, Teradata, Redshift, Snowflake, and a few others.
3.BI-Pentaho BI, SSAS, SSRS, PowerBI, Tableau, QlikView, Cognos

Also, my daily job routine requires very good scripting skills: Bash, Powershell, Python, as well as deep knowledge of SQL and database performance tuning and optimization. 

Project history

01/2023 - 09/2023
Azure Cloud Architect
Plieger B.V. (Consumer goods and retail, 1000-5000 employees)

Initially, in my role as a cloud architect, I had to design and implement secure,
robust, and scalable Azure infrastructure for the needs of the data science team.
Later my responsibilities increased and I was in charge for the entire MS Azure
stack. I was also a maintainer of the old DS/BI systems, as well as an ETL
developer for some of the important data migration tasks.

Technologies:
    - Microsoft Azure (IaaS)
    - Azure Data Factory
    - Azure Databricks
    - Azure Data Lake Storage
    - Azure Database for PostgreSQL
    - Azure DevOps
    - JD Edwards (ERP)
    - SAS 9, SAS Viya (https://www.sas.com)
    
Responsibilities:
- Design, implement, and maintain BI/DS architecture on top of the MS Azure cloud.
- Support the data science team

01/2022 - 12/2022
Database Architect
The Swatch Group AG (Consumer goods and retail, >10.000 employees)

Review and help the client improve the database structure and ETL codebase of
one of their main projects.

Technologies
- SQL Server 2019
- SSIS 2019
Responsibilities
- DB architecture & development
Domain
- Luxury watches and jewelry

01/2018 - 12/2020
BI & DWH Consultant

Working as a consultant for various companies across EU.

01/2014 - 12/2015
BI & DWH Architect
SmartIT (Banks and financial services, 500-1000 employees)

Project A BI project for www.easycredit.bg , an international financial company based in
description and Bulgaria, specialized in the consumer financing and personal loans. My role as a BI
responsibilities Architect was to collect and review all business requirements, translate these
requirements to technical tasks and finally implement the latter by myself as part of
the Proof of Concept (PoC) phase of the project.

Technologies:
* Microsoft SQL Server 2008R2 BI stack - SSIS, SSAS, SSRS
* C# and PowerShell


Responsibilities:
* Project management and Business Analysis
* Relational and Multi-Dimensional modeling (Kimball, Data Vault 2.0)
* ETL and C# development
* Database performance tuning - query optimization, indexing, table and index
partitioning, etc....


Skills:
* SQL, T-SQL, MDX

01/2012 - 01/2014
Business Intelligence Developer
Xentio Ltd.

Project A BI project for an international transportation company, to help analysis of air and
description ocean freight. My role as a senior developer was to enhance and improve the Data
and Warehouse as well as the ETL process responsible for the data loading. Another
responsibilities focus of the position was to maintain the Cognos BI part of the project.

Technologies:
* Oracle Data Integrator 11g (ODI)
* Teradata 13.x
* Cognos BI 8.4


Responsibilities:
* Business Analysis
* Relational and Multi-Dimensional modeling (Inmon)
* ETL and Java development
* Database performance tuning - query optimization, indexing, table and index
partitioning, etc....

Skills:
* ELT, SQL, OLAP
* Java, BASH

01/2011 - 01/2012
Business Intelligence Developer
eCommera Ltd. (Internet and Information Technology, 250-500 employees)

ecommera.com

Project The "Intelligent Trader" was an analytical platform to help online retailers drive
description and their business. My role in the project was to design and implement ETL procedures
responsibilities for loading the data into a Data Warehouse structure, as well as take part in the
design of the later. I also lead a redesign of a legacy ETL code.

Technologies:
* Pentaho BI Suite 3.7/3.8
* MySQL 5.1, Infobright 3.5
* RHEL 5
* Tomcat 5.x

Responsibilities:
* ETL and Java development
* Relational and Multi-dimensional design (Kimball)
* Database performance tuning - query optimization, indexing, table and index
partitioning, columnstore indexing, etc...


Skills:
* ETL, SQL, MDX, ROLAP
* Java

Local Availability

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